Abstract
Trapelia coarctata is lichenized withChlorella saccharophila var.ellipsoidea; this is in accordance with one of two former statements. The cells of the isolated alga may be covered individually by a gelatinous envelope; they also can be embedded in confluent mucilage. The course of succedanous divisions leading to the formation of autospores starts with the appearance of a second, new pyrenoid and goes on with bipartioning of the chloroplast, nuclear division and cytokinesis. Starch grains identical to those in the stroma surround the pyrenoid more or less loosely and not in the form of saucer-shaped parts constituting a coherent shell.
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